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https://www.readbyqxmd.com/read/28521958/eutrophication-decrease-phosphate-adsorption-processes-in-presence-of-nitrates
#1
Susana P Boeykens, M Natalia Piol, Lisa Samudio Legal, Andrea B Saralegui, Cristina Vázquez
Eutrophication causes aquatic environment degradation as well as serious problems for different purposes of water uses. Phosphorus and nitrogen, mainly as phosphate and nitrate respectively, are considered responsible for eutrophication degradation. The focus of this work was the study of adsorption processes for decreasing phosphate and nitrate concentrations in bi-component aqueous systems. Dolomite and hydroxyapatite were selected as low-cost adsorbents. Obtained results showed that both adsorbents have high capacity for phosphate adsorption which the presence of nitrate does not modify...
May 15, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28521206/decontamination-of-multiple-heavy-metals-containing-effluents-through-microbial-biotechnology
#2
Minxi Wu, Jingjing Liang, Jie Tang, Guang Li, Shiping Shan, Zhaohui Guo, Le Deng
To decontaminate heavy metal-containing waste water, a microbial biotechnology was developed by using the synergy between Sulfate reducing bacteria (SRB), Bacillus cereus (B. cereus) and Camellia oleifera cake (COC). In this process the COC degradation assisted by B.cereus, created an anoxic environment and provided energy and nutrition for SRB. Both of B. cereus and SRB played significant roles through biosorption, bioaccumulation and biosurfactant production. Meanwhile, a flotation technology commonly used in many effluent treatments has been led into this system for increasing the efficiency as well...
May 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28515631/water-and-air-ozone-treatment-as-an-alternative-sanitizing-technology
#3
REVIEW
M Martinelli, F Giovannangeli, S Rotunno, C M Trombetta, E Montomoli
AIMS: We investigated the effectiveness of ozone (aqueous and gaseous) treatment as an alternative sanitizing technology to common conventional disinfectants in reducing the microbial contamination of both water and air. METHODS: Ozone was added for 20 minutes to a well-defined volume of water and air by the system named "Ozonomatic(®)". The effectiveness of ozonation was determined by counting CFU/ m3 or ml of bacteria present in samples of air or water collected before (T0) and after (T1) the addition of ozone and comparing the microbial load of different bacteria present in ozonized and nonozonized samples...
March 2017: Journal of Preventive Medicine and Hygiene
https://www.readbyqxmd.com/read/28514901/fixed-bed-study-for-bone-char-adsorptive-removal-of-refractory-organics-from-electrodialysis-concentrate-produced-by-petroleum-refinery
#4
Patrícia da Luz Mesquita, Cássia Ribeiro Souza, Nilza Tatiane G Santos, Sônia Denise Ferreira Rocha
Water reuse in industrial processes has been an increasing need encouraged in recent years. However, as the streams are recycled, solutes accumulate, thus requiring purification techniques. Membrane processes (reverse osmosis and electrodialysis) have been implemented and in order to increase the reuse of water at its highest level, crystallization has been evaluated to remove salts from the concentrate produced and get a feasible disposal. Nevertheless, contaminants affect the crystallization performance, thus making the removal of residual organics important for both, the efficiency of crystallization as well as the increase of water reuse...
May 17, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28511359/occurrence-of-chemical-contaminants-in-peri-urban-agricultural-irrigation-waters-and-assessment-of-their-phytotoxicity-and-crop-productivity
#5
Anna Margenat, Víctor Matamoros, Sergi Díez, Núria Cañameras, Jordi Comas, Josep M Bayona
Water scarcity and water pollution have increased the pressure on water resources worldwide. This pressure is particularly important in highly populated areas where water demand exceeds the available natural resources. In this regard, water reuse has emerged as an excellent water source alternative for peri-urban agriculture. Nevertheless, it must cope with the occurrence of chemical contaminants, ranging from trace elements (TEs) to organic microcontaminants. In this study, chemical contaminants (i.e., 15 TEs, 34 contaminants of emerging concern (CECs)), bulk parameters, and nutrients from irrigation waters and crop productivity (Lycopersicon esculentum Mill...
May 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28509531/hierarchical-porous-structured-sio2-sno2-nanofibrous-membrane-with-superb-flexibility-for-molecular-filtration
#6
Haoru Shan, Xueqin Wang, Feihao Shi, Jianhua Yan, Jianyong Yu, Bin Ding
The separation and purification of chemical molecules from organic media under harsh chemical environments is of vital importance in the fields such as water treatment, biomedical engineering, and organic recycling. Herein, we report the preparation of a flexible SiO2/SnO2 nanofibrous membrane (SiO2/SnO2 NFM) with high surface area and hierarchical porous structure by selecting poly (vinyl butyral) as pore-forming agent and embedding crystalline phase into amorphous matrix without using surfactant as sacrificial template or special heat treatment...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28501195/recycling-polymer-residues-to-synthesize-magnetic-nanocomposites-for-dispersive-micro-solid-phase-extraction
#7
Hoda Ghambari, Emilia M Reyes-Gallardo, Rafael Lucena, Mohammad Saraji, Soledad Cárdenas
The ubiquitous presence of plastics, an obvious consequence of their usefulness and low price, has turned them into a problem of environmental and safety concern. The new plastic economy, an initiative recently launched by the World Economic Forum and Ellen MacArthur Foundation, with analytical support from McKinsey & Company, promotes a change in the use of plastic worldwide around three main pillars: redesign, reusing and recycling. Recycled plastics, with the aim of extending their life spam, can be used to synthesize materials for analytical purposes...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28500549/adsorption-affinity-and-selectivity-of-3-ureidopropyltriethoxysilane-grafted-oil-palm-empty-fruit-bunches-towards-mercury-ions
#8
Magendran Kunjirama, Norasikin Saman, Khairiraihanna Johari, Shiow-Tien Song, Helen Kong, Siew-Chin Cheu, Jimmy Wei Ping Lye, Hanapi Mat
This study was conducted to investigate the potential application of oil palm empty fruit branches (OPEFB) as adsorbents to remove organic methylmercurry, MeHg(II), and inorganic Hg(II) from aqueous solution. The OPEFB was functionalized with amine containing ligand namely 3-ureidopropyltriethoxysilane (UPTES) aiming for better adsorption performance towards both mercury ions. The adsorption was found to be dependent on initial pH, initial concentraton, temperatures, and contact time. The maximum adsorption capacities (Qm...
May 13, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28498124/treatment-and-potential-reuse-of-greywater-from-schools-a-pilot-study
#9
Abdalrahman D Alsulaili, Mohamed F Hamoda, Rawa Al-Jarallah, Duaij Alrukaibi
This study presented performance data on a low cost and easy maintenance pilot system for on-site treatment and reuse of water collected from wash sinks and fountains, as major sources of greywater (GW) at schools. Various treatment options were studied including screening, sand filtration, chlorination, and UV disinfection operated at different flow rates. Results showed that filtration operated at low rates is very effective in total suspended solids (TSS) removal, while UV proved to be more effective than chlorination for reduction of biochemical oxygen demand (BOD), chemical oxygen demand (COD), and total coliforms...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28498115/field-campaign-on-sediment-transport-behaviour-in-a-pressure-main-from-pumping-station-to-wastewater-treatment-plant-in-berlin
#10
M Gunkel, E Pawlowsky-Reusing
As part of the project KURAS, the Berliner Wasserbetriebe realized a field campaign in 2015 in order to increase the process knowledge regarding the behaviour of transported sediment in the pressure main leading from the pumpstation to the wastewater treatment plant. The field campaign was conducted because of a lack of knowledge about the general condition of the pressure main due to its bad accessibility and the suspicion of deposits caused by hydraulic underload. The practical evidence of the sediment transport performance of this part of the sewer system, dependent on different load cases, should present a basis for further analysis, for example regarding flushing measures...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28497961/evaluating-the-development-of-biocatalytic-technology-for-the-targeted-removal-of-perchlorate-from-drinking-water
#11
Justin M Hutchison, Jeremy S Guest, Julie L Zilles
Removing micropollutants is challenging in part because of their toxicity at low concentrations. A biocatalytic approach could harness the high affinity of enzymes for their substrates to address this challenge. The potential of biocatalysis relative to mature (non-selective ion exchange, selective exchange, and whole-cell biological reduction) and emerging (catalysis) perchlorate-removal technologies was evaluated through a quantitative sustainable design framework, and research objectives were prioritized to advance economic and environmental sustainability...
May 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28494425/application-of-the-weap-model-in-strategic-environmental-assessment-experiences-from-a-case-study-in-an-arid-semi-arid-area-in-china
#12
Jingjing Gao, Per Christensen, Wei Li
This article investigated how the use of a water resources assessment model contributed to one of the first strategic environmental assessments (SEA) conducted for arid/semi-arid regions in China. The study was based on the SEA of a coal industry development plan in Ordos, an arid/semi-arid region of northwest China, where a temporally and spatially simplified version of the WEAP (Water Evaluation And Planning System) model was applied for assessing the impact of the planned activities on local water resource system...
May 8, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28493879/heterogeneous-ag-tio2-sio2-composite-materials-as-novel-catalytic-systems-for-selective-epoxidation-of-cyclohexene-by-h2o2
#13
Xin Wang, Jianyue Xue, Xinyun Wang, Xiaoheng Liu
TiO2-SiO2 composites were synthesized using cetyl trimethyl ammonium bromide (CTAB) as the structure directing template. Self-assembly hexadecyltrimethyl- ammonium bromide TiO2-SiO2/(CTAB) were soaked into silver nitrate (AgNO3) aqueous solution. The Ag-TiO2-SiO2(Ag-TS) composite were prepared via a precipitation of AgBr in soaking process and its decomposition at calcination stage. Structural characterization of the materials was carried out by various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption and ultraviolet visible spectroscopy (UV-Vis)...
2017: PloS One
https://www.readbyqxmd.com/read/28493156/mini-review-high-rate-algal-ponds-flexible-systems-for-sustainable-wastewater-treatment
#14
REVIEW
P Young, M Taylor, H J Fallowfield
Over the last 20 years, there has been a growing requirement by governments around the world for organisations to adopt more sustainable practices. Wastewater treatment is no exception, with many currently used systems requiring large capital investment, land area and power consumption. High rate algal ponds offer a sustainable, efficient and lower cost option to the systems currently in use. They are shallow, mixed lagoon based systems, which aim to maximise wastewater treatment by creating optimal conditions for algal growth and oxygen production-the key processes which remove nitrogen and organic waste in HRAP systems...
June 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28488931/lightweight-bricks-manufactured-from-ground-soil-textile-sludge-and-coal-ash
#15
Chuihan Chen, Hongjuan Wu
Reuse of textile sludge as construction materials has been proved to an economic and environmental friendly strategy to mitigate its disposal problems. Previous studies have illustrated the successful fabrication of common fired bricks using textile sludge as a partial replacement of clay, but no such a specific work was focused on the feasibility of manufacturing lightweight bricks from textile sludge. In this study, a strategy involving the mixing of ground soil, textile sludge, and coal ash as the raw materials for the successful producing of lightweight bricks is presented...
May 10, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28488568/life-cycle-energy-analysis-of-reclaimed-water-reuse-projects-in-beijing
#16
Yupeng Fan Erhui Guo Yuanzheng Zhai Andrew C Chang Qi Qiao Peng Kang
To illustrate the benefits of water reuse project, the process-based life cycle analysis (LCA) could be combined with input-output life cycle analysis to evaluate the water reuse project. Energy is the only evaluation parameter used in this study. Life cycle assessment of all energy inputs (LCEA) is completed mainly by the life cycle inventory (LCI), taking into account the full life cycle including the construction, the operation, and the demolition phase of the project. Assessment of benefit from water reuse during the life cycle should focus on sewage discharge reduction and water-saving benefits...
May 1, 2017: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28487912/efficient-purification-of-arsenic-contaminated-water-using-amyloid-carbon-hybrid-membranes
#17
Sreenath Bolisetty, Noemi Reinhold, Christophe Zeder, Monica N Orozco, Raffaele Mezzenga
We show the purification of arsenic-contaminated water using amyloid fibril-based membranes, which adsorb both the arsenate (+5) and arsenite (+3) oxidation forms at efficiencies of ∼99%. Binding isotherms indicate that amyloid fibrils possess multiple binding residues capable of strongly adsorbing arsenic ions via metal-ligand interactions, delaying the saturation of the membrane. We also show that these membranes can be reused for several cycles without any efficiency drop, and validate our technology in purifying real contaminated ground water by removing arsenic with an efficiency as high as 99...
May 10, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28482324/application-of-cell-based-assays-for-toxicity-characterization-of-complex-wastewater-matrices-possible-applications-in-wastewater-recycle-and-reuse
#18
Preeti Shrivastava, Pravin K Naoghare, Deepa Gandhi, S Saravana Devi, Kannan Krishnamurthi, Amit Bafana, Sanjay M Kashyap, Tapan Chakrabarti
Exposure to pre-concentrated inlet or outlet STP wastewater extracts at different concentrations (0.001% to 1%) induced dose-dependent toxicity in MCF-7 cells, whereas drinking water extracts did not induce cytotoxicity in cells treated. GC-MS analysis revealed the occurrence of xenobiotic compounds (Benzene, Phthalate, etc.) in inlet/outlet wastewater extracts. Cells exposed to inlet/outlet extract showed elevated levels of reactive oxygen species (ROS: inlet: 186.58%, p<0.05, outlet, 147.8%, p<0.01) and loss of mitochondrial membrane potential (Δψm: inlet, 74...
August 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28481520/janus-graphene-oxide-sponges-for-high-purity-fast-separation-of-both-water-in-oil-and-oil-in-water-emulsions
#19
Jongju Yun, Fakhre Alam Khan, Seunghyun Baik
Membrane separation of oil and water with high purity and high permeability is of great interest in environmental and industrial processes. However, membranes with fixed wettability can separate only one type of surfactant-stabilized emulsion (water-in-oil or oil-in-water). Here, we report on Janus graphene oxide (J-GO) sponges for high purity and high permeability separation of both water-in-oil and oil-in-water emulsions. Millimeter-scale reduced GO sponges with a controlled pore size (11.2 or 94.1 μm) are synthesized by freeze drying, and the wettability is further controlled by fluorine (hydrophobic/oleophilic in air) or oxygen (hydrophilic/oleophilic in air) functionalization...
May 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28476976/review-on-nanoadsorbents-a-solution-for-heavy-metal-removal-from-wastewater
#20
REVIEW
Vinni Novi Thekkudan, Vinoth Kumar Vaidyanathan, Senthil Kumar Ponnusamy, Christy Charles, SaiLavanyaa Sundar, Dhanya Vishnu, Saravanan Anbalagan, Vasanth Kumar Vaithyanathan, Sivanesan Subramanian
Elimination of heavy metals from contaminated streams is of prime concern due to their ability to cause toxic chaos with the metabolism of flora and fauna alike. Use of advanced nano-engineered technologies such as the innovative combination of surface chemistry, chemical engineering fundamentals and nanotechnology opens up particularly attractive horizons towards treatment of heavy metal contaminated water resources. The obtained product of surface engineered nanoadsorbent produced has successfully proven to show rapid adsorption rate and superior sorption efficiency towards the removal of a wide range of defiant heavy metal contaminants in wastewater...
April 2017: IET Nanobiotechnology
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